Using class without import in Java

//  Using class without import.
class  ImportTest
{
public static void main( String args[ ] )
{
 double  r, a;
 java.util.Scanner sc = new java.util.Scanner( System.in );
 
 System.out.print("Enter Radius : ");
 r = sc.nextDouble();
 
 a = 3.14 * r * r;
 
 System.out.println("Area of Circle : " + a);
}
}

Output:
Enter Radius : 10
Area of Circle : 314.0